85656487540 has 24 divisors (see below), whose sum is σ = 193715441640. Its totient is φ = 31627010688.

The previous prime is 85656487529. The next prime is 85656487541. The reversal of 85656487540 is 4578465658.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 25341156 + 85631146384 = 5034^2 + 292628^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85656487541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164723755 + ... + 164724274.

It is an arithmetic number, because the mean of its divisors is an integer number (8071476735).

Almost surely, 2^85656487540 is an apocalyptic number.

It is an amenable number.

85656487540 is an abundant number, since it is smaller than the sum of its proper divisors (108058954100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

85656487540 is a wasteful number, since it uses less digits than its factorization.

85656487540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329448051 (or 329448049 counting only the distinct ones).

The product of its (nonzero) digits is 32256000, while the sum is 58.

The spelling of 85656487540 in words is "eighty-five billion, six hundred fifty-six million, four hundred eighty-seven thousand, five hundred forty".